Preparation method of heat-conducting fiber reinforced high-heat-conducting graphite heat radiating fin

A technology of high thermal conductivity graphite and thermal fiber, applied in heat exchange equipment, heat exchange materials, lighting and heating equipment, etc., can solve the problem of poor strength and mechanical properties of pure heat conduction graphite sheet, difficulty in meeting the use requirements, graphite dust falling off, etc. problems, to achieve the effect of easy subsequent processing and use, light weight and enhanced strength

Inactive Publication Date: 2012-10-03
TIANNUO PHOTOELECTRIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional graphite heat sink processing method only uses a single graphite powder, or uses carbon black, boron nitride, copper powder, etc. to be filled with graphite particles. It is easy to cause graphite dust to fall off under heavy work, and the strength is small, the mechanical properties are poor, and it is difficult to meet the use requirements
The strength and mechanical properties of pure thermally conductive graphite sheets are far inferior to metals, which brings difficulties to subsequent processing
At the same time, due to the disadvantage of graphite being fragile, it will cause problems such as complicated operation and easy damage during use.

Method used

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  • Preparation method of heat-conducting fiber reinforced high-heat-conducting graphite heat radiating fin
  • Preparation method of heat-conducting fiber reinforced high-heat-conducting graphite heat radiating fin
  • Preparation method of heat-conducting fiber reinforced high-heat-conducting graphite heat radiating fin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Select natural graphite powder and graphite short fiber with a carbon content of 98% and a particle size of 100 μm, and the mass ratio of graphite powder to graphite short fiber is 8:1. Put the natural graphite powder into the acid treatment solution for chemical treatment and impurity treatment, wash the treated graphite powder with water, then put it into the graphite expansion furnace for high temperature expansion, and then cool slowly after high temperature expansion. Mix the treated graphite powder according to the ratio of graphite powder: graphite fiber = 3:1 parts by mass, and then use graphite coil production equipment to make graphite with a density of 1.2g / cm3 and a thickness of 0.5mm for heat conduction and heat dissipation plate. Then mix the graphite short fibers in the water-based pressure-sensitive adhesive, stir and disperse evenly with a high-strength disperser, and spray evenly on the graphite heat sink. Bonding, and applying a certain pressure, fina...

Embodiment 2

[0043] Select natural graphite powder and carbon fiber with a carbon content of 96% and a particle size of 200 μm, and the mass ratio of graphite powder to carbon fiber is 8:1. Put the natural graphite powder into the acid treatment solution for chemical treatment and impurity treatment, wash the treated graphite powder with water, then put it into the graphite expansion furnace for high temperature expansion, and then cool slowly after high temperature expansion. Mix the treated graphite powder according to the ratio of graphite powder: graphite fiber = 10:1 parts by mass, and then use graphite coil production equipment to make a graphite heat-conducting and heat-dissipating plate with a thickness of 1.2g / cm3 and a thickness of 1.0mm. Then mix the carbon fiber in the water-based pressure-sensitive adhesive, stir and disperse evenly with a high-strength disperser, then spray evenly on the graphite heat sink, and after it is completely dry, quickly bond with another piece of the...

Embodiment 3

[0045] Choose natural graphite powder and carbon fiber cloth with a carbon content of 98% and a particle size of 500 μm, and the mass ratio of graphite powder to carbon fiber cloth is 7:1. Put the natural graphite powder into the acid treatment solution for chemical treatment and impurity treatment, wash the treated graphite powder with water, then put it into the graphite expansion furnace for high temperature expansion, and then cool slowly after high temperature expansion. The treated graphite powder is mixed according to the ratio of graphite powder: graphite fiber = 6:1 parts by mass, and then passed through graphite coil production equipment with a density of 0.8g / cm3 and a thickness of 0.5mm. Then, one side of the prepared graphite heat sink is evenly coated with water-based pressure-sensitive adhesive. After it is completely dry, quickly coat the carbon fiber cloth on the water-based pressure-sensitive adhesive, and then apply the other piece of graphite heat sink coate...

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Abstract

The invention provides a preparation method of a heat-conducting fiber reinforced high-heat-conducting graphite heat radiating fin, comprising the following steps of: pretreating graphite powder; processing the pretreated graphite powder by using graphite foil production equipment to prepare a graphite heat conducting and radiating plate; and spraying and sticking the graphite heat conducting and radiating plate and chopped graphite fiber, carbon fiber cloth or carbon fiber as a reinforcing agent by using a binder to prepare the heat-conducting fiber reinforced high-heat-conducting graphite heat radiating fin. The preparation method of the heat-conducting fiber reinforced high-heat-conducting graphite heat radiating fin is used for overcoming the defects such as low mechanical property, short service life, easiness for fall off and the like existing in the traditional preparation process; the mechanical strength and the purity of the heat-conducting fiber reinforced high-heat-conducting graphite heat radiating fin are greatly improved and the convenience is provided for the following machining; the heat-conducting fiber reinforced high-heat-conducting graphite heat radiating fin has the advantages of small weight, high intensity, high heat conducting property and the like; and the application range of a graphite sheet is expanded.

Description

technical field [0001] The invention relates to a preparation method of a graphite heat sink, in particular to a preparation method of a high heat conduction graphite heat sink reinforced by a heat conduction fiber. Background technique [0002] With the rapid development of microelectronics integration technology and high-density printed board assembly technology, the assembly density has increased rapidly, the volume of electronic components and logic circuits has been reduced by thousands of times, and electronic instruments and equipment are becoming lighter, thinner, shorter and smaller. direction development. Under high-frequency operating frequency, the working thermal environment of semiconductors moves rapidly towards high temperature. At this time, the heat generated by electronic components accumulates and increases rapidly. Under the ambient temperature of use, electronic components must still work normally with high reliability , and the ability to dissipate he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B37/10B32B37/12
CPCB32B37/12C09K5/14B32B37/10H05K7/20H01L23/373F28F3/02F28F21/02H01L23/3733H01L2924/0002
Inventor 余凤斌宫以娟朱焰焰
Owner TIANNUO PHOTOELECTRIC MATERIAL
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